A5014966500- ZnO doping and properties
- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Gas Sensing Nanomaterials and Sensors
- Ga2O3 and related materials
- Advanced Memory and Neural Computing
- GaN-based semiconductor devices and materials
- Electrospun Nanofibers in Biomedical Applications
- Micro and Nano Robotics
- Advanced Nanomaterials in Catalysis
- Pickering emulsions and particle stabilization
- Quantum Dots Synthesis And Properties
- Advanced Sensor and Energy Harvesting Materials
- Neural dynamics and brain function
- Neuroscience and Neural Engineering
- Advanced Materials and Mechanics
- Polymer Surface Interaction Studies
- Tissue Engineering and Regenerative Medicine
- Polymer-Based Agricultural Enhancements
- Collagen: Extraction and Characterization
- Electrochemical sensors and biosensors
- Geotechnical Engineering and Soil Stabilization
- Nanowire Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- Molecular Communication and Nanonetworks
Technical University of Moldova
2015-2024
Academy of Sciences of Moldova
2018
Academy of Romanian Scientists
2018
National Institute for Research and Development in Microtechnologies
2018
University of Bucharest
2018
An electrochemical approach for manufacturing light-driven nanostructured titanium dioxide (TiO2 ) microengines with controlled spatial architecture improved performance is reported. The based on microscale arrays of TiO2 nanotubes variable (50-120 nm) inner diameter show a quasi-ordered arrangement nanotubes, being the smallest tubular entities catalytic reported to date. exhibit well defined crystalline phases depending upon postfabrication annealing conditions that determine microengines'...
In March 2017, a small hoard of tools consisting six bronze sickles was discovered near the village Călmățui (Hâncești district). All items are hooked sickles, well known in Carpathian-Dniester region during Late Bronze Age – BrD-HaA1 (13th century first half 12th BC). particular, several similar finds on Middle and Lower Prut. Typological analysis showed that all belong to Ghermănești type, Ruginoasa variant, which allows us narrow chronological interval second 13th BC. Elementary chemical...
Abstract The development of functional microstructures with designed hierarchical and complex morphologies large free active surfaces offers new potential for improvement the pristine properties by synergistic combination microscopic as well nanoscopic effects. In this contribution, dedicated methods transmission electron microscopy (TEM) including tomography are used to characterize hierarchically structured hybrid GaN/ZnO:Au microtubes containing a dense nanowire network on their interior....
Aeromaterials represent a class of increasingly attractive materials for various applications. Among them, aero-ZnS has been produced by hydride vapor phase epitaxy on sacrificial ZnO templates consisting networks microtetrapods and proposed microfluidic In this paper, cost-effective technological approach is the fabrication using physical transport with Sn 2 S 3 crystals as precursors. The morphology material investigated scanning electron microscopy (SEM), while its crystalline optical...
In this paper, fabrication of a new material is reported, the so-called Aero-Ga2O3 or Aerogallox, which represents an ultra-porous and ultra-lightweight three-dimensional architecture made from interconnected microtubes gallium oxide with nanometer thin walls. The fabricated using epitaxial growth ultrathin layer nitride on zinc microtetrapods followed by decomposition sacrificial ZnO oxidation GaN according to results X-ray diffraction (XRD) photoemission spectroscopy (XPS)...
A new type of photocatalyst is proposed on the basis aero-β-Ga2O3, which a material constructed from network interconnected tetrapods with arms in form microtubes nanometric walls. The aero-Ga2O3 obtained by annealing aero-GaN fabricated epitaxial growth ZnO microtetrapods. hybrid structures composed functionalized Au or Pt nanodots were tested for photocatalytic degradation methylene blue dye under UV visible light illumination. functionalization noble metals results enhancement...
In this paper, new aeromaterials are proposed on the basis of titania thin films deposited using atomic layer deposition (ALD) a sacrificial network ZnO microtetrapods. The technology consists two technological steps applied after ALD, namely, thermal treatment at different temperatures and etching template. Two procedures for etching, one which is wet in citric acid aqua solution, while other hydride vapor phase epitaxy (HVPE) system with HCl hydrogen chemicals. morphology, composition,...
This work reports on the fabrication and characterization of a robust pressure sensor based aero‐GaN. The ultraporous aeromaterial consists GaN interconnected hollow micro‐tetrapods with wall thickness about 70 nm. inner surface contains an ultrathin film ZnO genetically related to sacrificial template used for epitaxial deposition GaN. sensing measurements disclose nearly linear dependence electrical conductance versus applied up 40 atm, stable state signal being attained after interval 10 s.
Abstract The electrodynamic properties of the first aero-material based on compound semiconductor, namely Aero-GaN, in terahertz frequency region are experimentally investigated. Spectra complex dielectric permittivity, refractive index, surface impedance measured at frequencies 4–100 cm −1 and temperature interval 4–300 K. shielding found experimental data. shows excellent effectiveness range from 0.1 to 1.3 THz, exceeding 40 dB a huge bandwidth, which is high interest for industrial...
The escalating global problem of antibiotic contamination in wastewater demands innovative and sustainable remediation technologies. This paper presents a highly efficient photocatalytic material for water purification: three-dimensional ultra-porous structure interconnected GaN hollow microtetrapods (aero-GaN), its performance being further enhanced by noble metal nanodot functionalization. novel aero-nanomaterial achieves more than 90 % tetracycline degradation within 120 min under UV...
We show that ultrathin GaN membranes, with a thickness of 15 nm and planar dimensions 12 × 184 μm2, act as memristive devices. The behavior is due to the migration negatively-charged deep traps, which form in volume membrane during fabrication process, towards unoccupied surface states suspended membranes. time constant process order tens seconds varies current or voltage sweep.
We demonstrate experimentally that a sample of SnS2 layered semiconductor compound with the area 1 cm2 and thickness 100 μm, contacted laterally by silver electrodes mm2, acts naturally as memristor device when illuminated sun simulator. Although conductance changes number pulses or voltages sweeps, current-voltage dependence is almost linear, showing only very narrow but clearly pinched hysteresis, which main imprint memristor. This SnS2-based solid-state miniaturized photomemristor could...
We demonstrate experimentally that single crystalline GaN nanomembranes arranged in simple networks exhibit learning mechanisms such as habituation and dishabituation followed by storage of the response to a certain electrical stimulus. These artificial are analogous non-associative processes which identical animals human beings. found time depends on number membranes parallel, this parameter decreases 30% when three memristors connected parallel compared memristor. Moreover, an increased...
The interaction of semiconductor nanoparticles with bio-molecules attracts increasing interest researchers, considering the reactivity and possibility to control their properties remotely giving mechanical, thermal, or electrical stimulus surrounding bio-environment. This work reports on a systematic comparative study protein-corona formation aluminum doped zinc oxide gallium nitride nanoparticles. Bovine serum albumin was chosen as protein model. Dynamic light scattering, transmission...
We report on self-propelled rotating liquid marbles fabricated using droplets of alcoholic solution encapsulated in hollow microtetrapods GaN with hydrophilic free ends their arms and hydrophobic lateral walls. Apart from stationary rotation, elongated-spheroid-like were found, for the first time, to exhibit pulsed rotation water surfaces characterized by a threshold speed which increased weight marble while frequency pulses proved decrease. To throw light upon unusual behavior developed...
On page 5497, M. Guix and co-workers demonstrate a novel light-driven microengine consisting of arrays self-arranged titanium dioxide nanotubes with conical inner diameter. Under exposure to UV irradiation, the shows directed motion in solution, both presence absence hydrogen peroxide, exhibits cargo capabilities, namely controlled pick-up, transport release microscale particles.
Titanium dioxide remains one of the most studied semiconductor for photocatalytic applications due to its low cost production, reduced toxicity, ability break down organic pollutants and possibility achieve complete mineralization. In this work, we report on results activity titanium nanotubes fabricated by electrochemical anodization technique in an electrolyte solution containing a mixture hydrofluoric acid, ethylene glycol phosphoric acid. The morphology crystallinity obtained were...